linux-kernel - Re: [PATCH nf] netfilter/osf: avoid OOB read

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Message-ID: <20230830225921.GA15759@breakpoint.cc>
Date:   Thu, 31 Aug 2023 00:59:21 +0200
From:   Florian Westphal <fw@...len.de>
To:     Wander Lairson Costa <wander@...hat.com>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "open list:NETFILTER" <netfilter-devel@...r.kernel.org>,
        "open list:NETFILTER" <coreteam@...filter.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Lucas Leong <wmliang@...osec.exchange>, stable@...nel.org
Subject: Re: [PATCH nf] netfilter/osf: avoid OOB read

Wander Lairson Costa <wander@...hat.com> wrote:
> The opt_num field is controlled by user mode and is not currently
> validated inside the kernel. An attacker can take advantage of this to
> trigger an OOB read and potentially leak information.

[..]

Can you send a v2 that rejects bogus nf_osf_user_finger structs?

nfnl_osf_add_callback() seems to be the right place to refuse it.